Скачать или смотреть Solve Your SwiftUI Bounce Animation Issues: Step-by-Step Guide

Learn how to fix bounce animation issues in SwiftUI that only work after a second tap. Dive into the solution for a smoother user experience!
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This video is based on the question https://stackoverflow.com/q/74614119/ asked by the user 'venky' ( https://stackoverflow.com/u/2656094/ ) and on the answer https://stackoverflow.com/a/74628632/ provided by the user 'vacawama' ( https://stackoverflow.com/u/1630618/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering SwiftUI Bounce Animation: How to Fix the Double Tap Issue

If you've ever faced the frustrating issue of animations not working as expected in SwiftUI, you're not alone. A common problem is when a bounce animation only triggers after a second tap. This typically occurs when trying to animate a newly introduced view right after its visibility changes. In this guide, we're going to dive into understanding this problem and offer a clear solution to ensure your animations work seamlessly.

The Problem: Animation Not Triggering Correctly

Imagine you're building an interactive application and you want to create a bouncing circle that appears when you tap a button. However, you notice that this animation only starts working after a second tap. What gives? This issue arises because SwiftUI requires a distinct “before view” state for animations, and you're inadvertently introducing the view at the same time you update the animation state. As a result, SwiftUI doesn't have a reference view to animate from initially.

The Solution: Modify Your View Extension

To resolve this problem, we need to tweak the way we handle view visibility in SwiftUI. Instead of completely hiding the view, we can adjust its opacity. This keeps the view present on the screen at all times, allowing it to animate smoothly when it becomes visible.

Updated Code

Here's how to implement this solution. We modify the hides extension to adjust the opacity instead of hiding the view:

[[See Video to Reveal this Text or Code Snippet]]

By doing this, we're ensuring that the circle view remains on the screen but becomes invisible when isViewHidden is set to true. Now, SwiftUI has a consistent “before view” it can animate from, which solves the double tap issue.

Final ContentView Structure

Your updated ContentView should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion: Enjoy Smoother Animations

By making this single adjustment to how we handle view visibility, you'll find that your animations will trigger correctly with just one tap. No more bouncing around waiting for that second tap! Now you can focus on creating engaging user experiences without any unwarranted hiccups. Happy coding!